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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23e3810263d02569d73f8ab32a6bde4b12055fc2ddfa6a7d0f8da7ecce14deee' 
  AND token = 'wyYjOLDHP8ZZ64FfY9aGjXnB+7bPALADgH5XBpQcL3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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