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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c62ff4020a57c29a4d45b46571bbe13c8e665c9f7e3c44edb5d37b8bc5236d8' 
  AND token = 'oJxuIjKbMxanra0yPaQh0zimK51FeihEvO4fbC39vHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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