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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ea0d0218812fe0f01308bdfe2370d5b5b2cd91f40ff7a2267de11469320fa42' 
  AND token = 'doPw5ikMf6ALHie1p/3CPrx1YhFOTCc0NQcnvLY+hEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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