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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f64ca052177df9a0d9a38ef16f4bda93e2608b0fa6d6b696f673059b2409800' 
  AND token = 'p+EIqeSFt/SJ49nkmJcJ4R7IKr7fJWwNmUPrN05yqlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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