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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caca7cc234e72dc443fe08e512a6c7c90ca08d687daabde0466c53d9f033589d' 
  AND token = 's/8QgMEm3oJDyakuswDosSQHfSmDCwlpg5WzM1+pNF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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