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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3f389dc86757f03e12d1114c1c6c6089dd02d5f817136c0719781f7714c172f' 
  AND token = 'tWMNIQnxvEI1R8vbnE2wPO+5QFTGI1yKGjXWXz7WjeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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