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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f41237ec3e0d6f31b87e0faf84214dcd3bbcb8a125efa8e62013593fa83e7bcb' 
  AND token = 'MuNb/N+U+6C5SezHq0V2mFLKA1a3da/EDsw9vzXj3FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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