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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da1a950b01b547e32499e7ed2dca9b65bf5480973d03fcef9e9a759baf1ab3ba' 
  AND token = 'Oz1vSu3e1RGkmowBMdR8sLHsgH6zg7vXbE2z/2r+uiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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