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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c63f523eff97a7a54917091e10c25d2b5e663eefcffaca673d65e4614dc42b5' 
  AND token = 'BT64ccm4hZGeCv1OMZbAMwQGeYd3n1GeOyoV1x582EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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