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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e690190eb166c0e74448dbe76ab67e792e7adef2a79030b0743b5eb6e6bf1bd' 
  AND token = 'X4gZYGb6jimI4vTs3YCiNrJhAsBcKfjjzw0Wv6C7aW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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