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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96753a043325288dd6614432f7f63a09545e7d5baae02f8264a6dea8b6612bdb' 
  AND token = 'SYl1gSDlwFnWBP0oO1ke4/K6NOuCEuAUM90xSq271p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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