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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f84c439ead0d870deaf4f911bcbe63ac3a63bcb4062cb0ade04ad69be7a3c3b' 
  AND token = '7TukWVAugZ+P78heNyUkOuQ7BEb8EsWCr5KGaolMDdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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