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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1d92af26709cfcbcdabf1c188fcb37f985394332c93be6533aaf6f91b7a36f9' 
  AND token = 'sBoh8GXWPJDeQfSNLwRHfJTw9lCmn3bXnEmvsO64wyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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