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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7407f4e9ec8e0fe099c98e79be149adf7595d97fcdfbcf30e33274e3bb6f8649' 
  AND token = 'UBIV9CcMCACySKgahNGShr7xMxapwX16cWuRWsehpno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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