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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '086d79ddaaacacba307cee76c1b0b2c6a857aa22227dfc70a7bd1c1d29f82c23' 
  AND token = 'BEG6D1AEBz3HkI0ssZ99T+h2ofmONpOGnCOVOobnSG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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