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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '514bbd5bf1a086bf6c70c3e29504f2f79e85f3311544bae6100d6d6423a4a82b' 
  AND token = 'yeXLQCtpohm5n5g/8QcCAT2JUIGMWxJfjuSXju4AWy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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