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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f25e8b450fb5de920054300f4d1cab32e3eecaaa12afaecc628b9ad31efe237c' 
  AND token = 'v5CksnEn06mXmqU1c/EBUxu71HRlrd1G6Ym0UJn+u1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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