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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86d090c0252156ec144f73c366b30428cc580695b24523c66d893929b58c9696' 
  AND token = 'MRsZc/X1+9NqfDtdCDFahb7HCOGM08E6AxbQmu7wpvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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