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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '961ef274e5d81d06bc4598a8f6261238ab1c640a2c0e7f73b3d940d653e0749e' 
  AND token = '01M8COm4i/YUn/E450W2z8aKrJbyGjH7NO3xLtmXMn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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