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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7128db6467c476aa9b9c0a237371295fa54d17a7f2de4ee85b1156e962c4ff2a' 
  AND token = 'XSghq11XIY225R5Il6aEM3G/vNTEVxnb6UpJ8KM5rs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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