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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd3ec5b85cc354b00468af53f9b5b3e4481f5b6feb1057e2635f45ca9bcfbadd' 
  AND token = 'XnOwBT6fO5v870AXfPuVAXcpVM7D5nAU9zLm5a0Vsds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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