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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3acb77e4e3e0147a05e5b8d80808014c8ab556df991dcf340e37658662c17e50' 
  AND token = '8btgMenM2RP6MDhEcmFTMcWD/ymPc1Za74E87h8zYDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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