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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3cd2808e411a1e82a06b70f70d6079672ab248cb4ca63275c14ab1fbcd725a5' 
  AND token = 'LUvG8RaWoUkKXNmUvsP1vf5gPJtG2O9m+0oVXy0VJHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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