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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae467ec2ffa1e91a436f733ec770cdce29b125e826e973b3eff659cf69f6bad8' 
  AND token = 'qpX0Uz8o/0ID20ikEBwdco3GldwjsBssJXAw2F6zP6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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