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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8c9b18d2182fec148b24356c3590152d3dd118c89dafe63ca0b046db94c4d04' 
  AND token = 'EYkJ1K2VPoNfEDzQpe2n+2sfhhzMLQ99Nivf5SZp/NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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