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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc503bceb4d42f422aea0d6e8094def77f0892a42bcc950c60a1e929b04084ed' 
  AND token = 'RgwVmHkjbPrL7nAXvL31fDUbb3qt+rB7lmz4sDwDY9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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