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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '594313f4aa916fdb705407fd0ca9ec0d16663ff08d4e7d515f87090e92e3bd10' 
  AND token = '65XGMs26UjajCAm9bKNgC/Q9VlTkdJhJfAWt26uPMpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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