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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72a224f0a84e12a877cb3a370c76e7f4940524976e3430fe24e42305a2b44bec' 
  AND token = '4OcNI+rMPv9qGqd0ZQWC67Iw2C+o/LaFV1u6g4UcUX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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