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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b7dbadebecd9f095fe2a05fc02d6ffb8f65855fec6398cb19f95406f53b195b' 
  AND token = '8pvLJwVIajDKR6+0om2ZnaeeMdRigS3mR0rB1OmilDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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