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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb6aec28987eb270e167e9f2bb7afa79a26ae55c5ddfbc1d81456268dd32dcd3' 
  AND token = 'aR4GBPRdlrGS07zeSXm/lX+rm1zKGl9hsqNhM2h08oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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