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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7f3062da815e705ef3a21ed1fcb04fa0f1051e36031757873a651605e467e3a' 
  AND token = 'MA1JOA3RdHMubPvS1IMTB6+Uie8o++vbs+xURlzNe/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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