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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '754401671f1242a187d8c0f5d5e136d27ee217f46928a8f3c95129087d86dd0b' 
  AND token = 'HZtj/y50mK/FDd5h+Fnh8cB8fZ8/Qru677n6e/en3iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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