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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fbedec723c96a128e00d94bd5bacbfb266e28250d71f0d49b6f67a47e45576c' 
  AND token = 'LmxXLnZ8atuWazyqjUEE46dTBp9x+YjR5Bne/qdmako=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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