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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03468cc6ca73e00bcd474692c5e6699017ac2c7995ee7fa4e07d6ddd5f7dc3a0' 
  AND token = 'o2jy070GQK7XLQRuGtcYvXOXqKp0QYPaLVEy1iR6+r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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