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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0956dc41caa68706790af5f0b807ac7841f249e67f39fd46add46c6a7cf5aa1' 
  AND token = 'K2s8qzdBqyei3kb885E21H60zDZTnrqLDJxBwSPB4so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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