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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b85e0fe2d0b946b2f3a5d8b2f6db974629e8cdb02462f29fb37188d82b18434' 
  AND token = 'zf3fOTF6V4kq9tOFVraAVzgRbn8uch67cCCjGnR2RPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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