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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08abc567d603dd4ced9353ea369a9033e29c35c2d38533037af48cb3e04516d1' 
  AND token = 'ab/GJRdJF98Q2n97pRsFXE0gMNQG6MN5hQ/w3oLuirQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}