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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d6883e0978bfc810c6b9604a4e06eeacb957debbe1eeabf02f8af650d83b576' 
  AND token = 'MPIhApxwInxeuE3DJst11vHLUSVv5CWpRW5LEP/RCwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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