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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '520fbd4755f1143b74367b5aa84f4aff97af1505ac5a233955843d841924618c' 
  AND token = 'OYNeDggEL4aeu77k8IgYrKNUejmwPzN4014SwcssQ5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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