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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1a02bff79fd4b4e3c97c627135f845fef83bbfe9d6aff0f933531aa0cea5c60' 
  AND token = 'xgDGTLlLEJ65IiCLOpI4/1mBWmkYCiXkGd3GLaCoL2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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