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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f230d1cb1a8bf36272daf47b33578756afb57f96fbe6fb324d25845ee9642041' 
  AND token = 'jyHFGIEbla54KtsgpAG4Ps1KfERC6hp31HVWRYEwrYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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