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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '549e72118fb6fed1ea973df9071e4fc6e7b22d6519ead6801a6cc64c272a626e' 
  AND token = '7sfVOHdYPHCnhskGujn1jbcJvN1lOcSkjjmWd+Nyom4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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