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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80fcf486ccd52fad38b0d218bd619ecc2d0a23648d09a03fcd8cac459e5c43d6' 
  AND token = 'kNGbPFwpLgfm7X0VnLrtlLbrVKIs+bRHGJfNDWdP5jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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