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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5a266115c10c2530648d2b7c3ecc6d3f443194cd7b794ecb0f7cf4bcee535f0' 
  AND token = 'g7Oam+984HINJ0+dc3yevF9GkxsvZ9DNcVkG1eyHnAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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