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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3358936c389a92834f6152a5856f03ac61a5743fc72d59318e9adaa3becfe3a8' 
  AND token = '+1wCmFejmixxEINqOLYHyUf+NilxnsMepvSaRDW69YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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